Researchers say the concept of achieving herd immunity threshold isn't the right finish line to end the pandemic. It's an elusive number to define in the first place, and it changes under various circumstances. Science correspondent Geoff Brumfiel talks with Maddie about the complexities in even defining the number and what the public should focus on instead.Learn more about sponsor message choices: podcastchoices.com/adchoices)NPR Privacy Policy)
